SELinuxHostTests: Enforce from shipping api 27 onwards.

The treble tests only run as part of CTS-on-gsi plan and
those are only enforceable from first_api_level >= 27

Bug: 67965044
Test: Trivial

Change-Id: I4fc046cc34e5b81f635308b6184e91b113eb9dac
Signed-off-by: Sandeep Patil <sspatil@google.com>
(cherry picked from commit 8e5b5a7241e6017ee377a9ec454ef045bbb8c29b)
diff --git a/hostsidetests/security/src/android/security/cts/SELinuxHostTest.java b/hostsidetests/security/src/android/security/cts/SELinuxHostTest.java
index 54f1a92..fb09788 100644
--- a/hostsidetests/security/src/android/security/cts/SELinuxHostTest.java
+++ b/hostsidetests/security/src/android/security/cts/SELinuxHostTest.java
@@ -267,7 +267,7 @@
      */
     public static boolean isFullTrebleDevice(ITestDevice device)
             throws DeviceNotAvailableException {
-        return PropertyUtil.getFirstApiLevel(device) > 25;
+        return PropertyUtil.getFirstApiLevel(device) > 26;
     }
 
     private boolean isFullTrebleDevice() throws DeviceNotAvailableException {